Tajikistan has a shared border with Afghanistan. Russia views Tajikistan as part of a security buffer for its southern border. Russia is therefore concerned about the possibility that recent changes in Afghanistan could infiltrate Tajikistan. Russia has announced "A batch of 30 upgraded T-72B3M tanks with improved combat characteristics will arrive to rearm the 201st Russian military base stationed in Tajikistan on [02 Teves 5782]". This comes in addition to practising repelling an enemy aerial attack on military facilities using its S-300PS systems.